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CN103196136A - Method and device for gradient utilization of oxygen-enriched combustion heat - Google Patents

Method and device for gradient utilization of oxygen-enriched combustion heat Download PDF

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CN103196136A
CN103196136A CN2013101541541A CN201310154154A CN103196136A CN 103196136 A CN103196136 A CN 103196136A CN 2013101541541 A CN2013101541541 A CN 2013101541541A CN 201310154154 A CN201310154154 A CN 201310154154A CN 103196136 A CN103196136 A CN 103196136A
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flue gas
oxygen
pressure feed
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heater
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CN103196136B (en
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段伦博
韩冬
段钰锋
向文国
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Southeast University
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Abstract

本发明公开了一种富氧燃烧热量梯级利用的方法，该方法包括以下步骤：步骤A:将锅炉（1）出口烟气分流成第一部分烟气、第二部分烟气和第三部分烟气；所述第一部分烟气作为循环烟气，重新送入锅炉（1）的炉膛，所述第二部分烟气对送入锅炉（1）的氧气进行预热，所述第三部分烟气对锅炉（1）高、低压给水进行加热；步骤B:第二部分烟气和第三部分烟气经换热后混合送入烟气冷凝器(17)，冷凝至常温后送入烟气压缩机(10)；步骤C:空气经过空气压缩机(7)压缩后，经过压缩空气低压给水加热器(8)冷却后送入制氧系统(9)，制氧系统产生(9)的氧气送入氧气预热器(2)。该发明显著提高富氧燃烧电站的发电效率，降低燃煤电站CO2捕集的成本。

The invention discloses a method for cascade utilization of oxygen-enriched combustion heat. The method comprises the following steps: Step A: splitting the flue gas at the outlet of the boiler (1) into a first part of flue gas, a second part of flue gas and a third part of flue gas ; The first part of the flue gas is re-sent into the furnace of the boiler (1) as circulating flue gas, the second part of the flue gas preheats the oxygen sent into the boiler (1), and the third part of the flue gas The boiler (1) heats the high and low pressure feed water; step B: the second part of flue gas and the third part of flue gas are mixed and sent to the flue gas condenser (17) after heat exchange, and sent to the flue gas compressor after being condensed to normal temperature (10); step C: after the air is compressed by the air compressor (7), it is sent into the oxygen production system (9) after being cooled by the compressed air low-pressure feed water heater (8), and the oxygen produced by the oxygen production system (9) is sent into Oxygen preheater (2). This invention significantly improves the power generation efficiency of oxy-fuel combustion power plants and reduces the cost of CO2 capture in coal-fired power plants.

Description

一种富氧燃烧热量梯级利用的方法及装置Method and device for cascade utilization of oxygen-enriched combustion heat

技术领域technical field

本发明涉及一种富氧燃烧热量梯级利用方法，属于能源技术和环保技术交叉领域。另外，本发明还涉及实施上述方法的装置。The invention relates to a method for cascade utilization of oxygen-enriched combustion heat, which belongs to the intersecting field of energy technology and environmental protection technology. In addition, the invention also relates to a device for carrying out the above-mentioned method.

背景技术Background technique

化石燃料燃烧排放的大量温室气体CO2对环境造成的危害已引起了全球的高度关注。在众多的CO2分离捕集技术当中，富氧燃烧技术作为一种新型的可低成本分离回收CO2且污染物排放较低的全新理念的燃烧方式已引起了各国研究者的重视。The harm to the environment caused by the large amount of greenhouse gas CO 2 emitted by the combustion of fossil fuels has attracted global attention. Among the many CO 2 separation and capture technologies, oxyfuel combustion technology, as a new combustion method with low-cost separation and recovery of CO 2 and low pollutant emissions, has attracted the attention of researchers from all over the world.

由于增加了空气分离子系统和烟气净化压缩子系统，机组发电效率较常规机组降低8%～12%，制约了富氧燃烧技术商业化应用。富氧燃烧系统较为复杂，存在较大的优化空间。尤其是空分子系统和烟气净化压缩子系统中产生大量的低品位的废热，充分利用此部分废热加热锅炉低压给水，可以减少汽轮机抽气，提高汽轮机做功量。同时，采用烟气加热给水，可有效控制排烟温度，实现热量回收的利用，有效提高机组发电效率。Due to the addition of the air separation subsystem and the flue gas purification and compression subsystem, the power generation efficiency of the unit is 8% to 12% lower than that of conventional units, which restricts the commercial application of oxygen-enriched combustion technology. The oxygen-enriched combustion system is relatively complex, and there is a large room for optimization. In particular, a large amount of low-grade waste heat is generated in the air molecule system and the flue gas purification and compression subsystem. Making full use of this part of waste heat to heat the low-pressure feed water of the boiler can reduce steam turbine extraction and increase steam turbine work. At the same time, the use of flue gas to heat the feed water can effectively control the exhaust gas temperature, realize the utilization of heat recovery, and effectively improve the power generation efficiency of the unit.

发明内容Contents of the invention

发明问题：本发明的目的是公开一种富氧燃烧机组热量利用方法，该方法可以显著提高富氧燃烧电站的发电效率。Problem of the invention: The purpose of this invention is to disclose a heat utilization method of an oxyfuel combustion unit, which can significantly improve the power generation efficiency of an oxyfuel combustion power plant.

技术方案：为解决上述技术问题，本发明公开一种富氧燃烧热量梯级利用的方法，该方法包括以下步骤：Technical solution: In order to solve the above technical problems, the present invention discloses a method for cascaded utilization of oxygen-enriched combustion heat. The method includes the following steps:

步骤A:将锅炉出口烟气分流成第一部分烟气、第二部分烟气和第三部分烟气；所述第一部分烟气作为循环烟气，重新送入锅炉的炉膛，所述第二部分烟气对送入锅炉的氧气进行预热，所述第三部分烟气对锅炉高、低压给水进行加热；Step A: the flue gas at the boiler outlet is divided into a first part of flue gas, a second part of flue gas and a third part of flue gas; the first part of flue gas is re-sent into the furnace of the boiler as circulating flue gas, and the second part of flue gas The flue gas preheats the oxygen fed into the boiler, and the third part of the flue gas heats the high and low pressure feed water of the boiler;

步骤B:第二部分烟气和第三部分烟气经换热后混合送入烟气冷凝器，冷凝至常温后送入烟气压缩机；Step B: the second part of the flue gas and the third part of the flue gas are mixed and sent to the flue gas condenser after heat exchange, and sent to the flue gas compressor after being condensed to normal temperature;

步骤C:空气经过空气压缩机压缩后，经过压缩空气低压给水加热器冷却后送入制氧系统，制氧系统产生的氧气送入氧气预热器；Step C: After the air is compressed by the air compressor, it is cooled by the compressed air low-pressure feed water heater and sent to the oxygen production system, and the oxygen produced by the oxygen production system is sent to the oxygen preheater;

步骤D:空气压缩机产生的压缩空气及烟气压缩机产生的压缩烟气对锅炉低压给水进行加热。Step D: The compressed air generated by the air compressor and the compressed flue gas generated by the flue gas compressor heat the boiler low-pressure feed water.

优选的，步骤A中还包括将预热后的氧气实际温度与预定温度比较，如果低于预定温度，则增加第二部分烟气量；如果高于预定温度，则减少第二部分烟气量。Preferably, step A also includes comparing the actual temperature of the preheated oxygen with the predetermined temperature, if it is lower than the predetermined temperature, then increasing the second part of the flue gas volume; if it is higher than the predetermined temperature, then reducing the second part of the flue gas volume .

优选的，所述步骤A中第一部分烟气占全部烟气的50%～70%，第二部分烟气占全部烟气的15%～25%。Preferably, in the step A, the first part of the flue gas accounts for 50% to 70% of the total flue gas, and the second part of the flue gas accounts for 15% to 25% of the total flue gas.

优选的，步骤A中经预热的氧气和循环烟气混合或者单独送入锅炉的炉膛。Preferably, the preheated oxygen in step A is mixed with the circulating flue gas or sent separately to the furnace of the boiler.

本发明还提供了一种富氧燃烧热量梯级利用的装置，该装置包括锅炉、氧气预热器、烟气给水加热器、压缩空气低压给水加热器、制氧系统、压缩烟气低压给水加热器、空气压缩机、烟气压缩机、烟气冷凝器；The present invention also provides a device for cascade utilization of oxygen-enriched combustion heat. The device includes a boiler, an oxygen preheater, a flue gas feedwater heater, a compressed air low-pressure feedwater heater, an oxygen production system, and a compressed flue gas low-pressure feedwater heater. , air compressor, flue gas compressor, flue gas condenser;

锅炉包括第一烟气出口端、第二烟气出口端和第三烟气出口端，第一烟气出口端与锅炉的第一烟气进口端相连；第二烟气出口端与氧气预热器的烟气进口端相连，第三烟气出口端与烟气给水加热器的烟气进口端相连；氧气预热器的烟气出口端烟气给水加热器的烟气出口端分别与烟气冷凝器的烟气进口端相连；The boiler includes a first flue gas outlet port, a second flue gas outlet port and a third flue gas outlet port, the first flue gas outlet port is connected to the first flue gas inlet port of the boiler; the second flue gas outlet port is preheated with oxygen The flue gas inlet port of the oxygen preheater is connected with the flue gas inlet port of the flue gas water heater; the flue gas outlet port of the oxygen preheater is connected with the flue gas outlet port of the flue gas The flue gas inlet port of the condenser is connected;

空气压缩机空气出口端与压缩空气低压给水加热器压缩空气进口端相连，压缩空气低压给水加热器的空气出口端与制氧系统的空气进口端相连，制氧系统的氧气出口端与氧气预热器的氧气进口端相连；The air outlet of the air compressor is connected to the compressed air inlet of the compressed air low-pressure feed water heater, the air outlet of the compressed air low-pressure feed water heater is connected to the air inlet of the oxygen production system, and the oxygen outlet of the oxygen production system is connected to the oxygen preheater The oxygen inlet port of the device is connected;

烟气压缩机烟气出口端与压缩烟气低压给水加热器压缩烟气进口端相连。The flue gas outlet port of the flue gas compressor is connected with the compressed flue gas inlet port of the compressed flue gas low-pressure feed water heater.

优选的，所述烟气给水加热器包括烟气高压给水加热器和烟气低压给水加热器，所述烟气高压给水加热器的烟气进口端与锅炉的第三烟气出口端相连；烟气高压给水加热器的烟气出口端与烟气低压给水加热器的烟气进口端相连，烟气低压给水加热的烟气出口端与冷凝的烟气进口端相连。Preferably, the flue gas feedwater heater includes a flue gas high-pressure feedwater heater and a flue gas low-pressure feedwater heater, and the flue gas inlet end of the flue gas high-pressure feedwater heater is connected to the third flue gas outlet end of the boiler; The flue gas outlet of the high-pressure gas feedwater heater is connected to the flue gas inlet of the flue gas low-pressure feedwater heater, and the flue gas outlet of the flue gas low-pressure feedwater heater is connected to the condensed flue gas inlet.

优选的，所述烟气高压给水加热器的给水进口端连接有用于抽取锅炉高压给水的第一水泵，烟气高压给水加热器设置第一流量控制器控制水泵的抽水量；所述烟气低压给水加热器的给水进口端连接有用于抽取锅炉低压给水的第二水泵，烟气低压给水加热器设置第二流量控制器控制水泵的抽水量；所述压缩空气低压给水加热器给水进口端连接有用与抽取锅炉低压给水的第三水泵，压缩空气低压给水加热器设置第三流量控制器控制水泵的抽水量；所述压缩烟气低压给水加热器给水进口端连接有用于抽取锅炉低压给水的第四水泵，压缩烟气低压给水加热器设置第四流量控制器控制水泵的抽水量。Preferably, the feedwater inlet end of the flue gas high-pressure feedwater heater is connected with a first water pump for extracting boiler high-pressure feedwater, and the flue gas high-pressure feedwater heater is provided with a first flow controller to control the pumping volume of the water pump; the flue gas low-pressure The feed water inlet end of the feed water heater is connected with a second water pump for extracting boiler low-pressure feed water, and the flue gas low-pressure feed water heater is provided with a second flow controller to control the pumping volume of the water pump; With the third water pump for extracting boiler low-pressure feed water, the compressed air low-pressure feed water heater is provided with a third flow controller to control the pumping volume of the water pump; The water pump and the compressed flue gas low-pressure feed water heater are provided with a fourth flow controller to control the pumping volume of the water pump.

有益效果：本发明采用上述技术方案后有益效果是：1)回收利用制氧系统及烟气净化压缩系统的废热，减少低压回热系统蒸汽抽气，增加汽轮机做功；2)综合利用烟气尾部余热，降低了锅炉排烟温度，提高富氧燃烧热量利用效率。Beneficial effects: the beneficial effects of the present invention after adopting the above-mentioned technical scheme are: 1) recycle the waste heat of the oxygen generation system and the flue gas purification compression system, reduce the steam pumping of the low-pressure reheating system, and increase the work of the steam turbine; 2) comprehensively utilize the tail of the flue gas The waste heat reduces the exhaust gas temperature of the boiler and improves the heat utilization efficiency of oxygen-enriched combustion.

附图说明Description of drawings

图1为富氧燃烧热量梯级利用的结构示意图。Fig. 1 is a structural schematic diagram of the cascaded utilization of oxygen-enriched combustion heat.

其中，锅炉1；氧气预热器2；高压给水加热器3；低压给水加热器4；高压回热器5；低压回热器6；空气压缩机7；压缩空气低压给水加热器8；制氧系统9；烟气压缩机10；压缩烟气低压给水加热器11；烟气净化压缩系统12；第一水泵13；第二水泵14；第三水泵15；第四水泵16，烟气冷凝器17。Among them, boiler 1; oxygen preheater 2; high pressure feed water heater 3; low pressure feed water heater 4; high pressure regenerator 5; low pressure regenerator 6; air compressor 7; compressed air low pressure feed water heater 8; oxygen production System 9; flue gas compressor 10; compressed flue gas low-pressure feed water heater 11; flue gas purification compression system 12; first water pump 13; second water pump 14; third water pump 15; fourth water pump 16, flue gas condenser 17 .

具体实施方式Detailed ways

下面结合附图与实施例对本发明做进一步说明。The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

本发明涉及一种富氧燃烧热量梯级利用方法，该方法可以显著提高系统热量利用率。本发明的另一核心是提供一种实施上述方法的装置。结构如图1所示。The invention relates to a method for cascade utilization of oxygen-enriched combustion heat, which can significantly improve the heat utilization rate of the system. Another core of the present invention is to provide a device for implementing the above method. The structure is shown in Figure 1.

本发明提供的富氧燃烧热量梯级利用的方法：The method for cascade utilization of oxygen-enriched combustion heat provided by the present invention:

对锅炉内排出的烟气进行分流，形成第一部分烟气、第二部分烟气和第三部分烟气。The flue gas discharged from the boiler is split to form the first part of flue gas, the second part of flue gas and the third part of flue gas.

利用所述第一部分烟气作为循环烟气，重新送入炉膛，所述第二部分烟气对送入锅炉的氧气进行预热，所述第三部分烟气对锅炉给水进行加热。The first part of flue gas is used as circulating flue gas to be re-sent into the furnace, the second part of flue gas is used to preheat the oxygen fed into the boiler, and the third part of flue gas is used to heat boiler feed water.

将送入炉膛的氧气的实际温度与预定温度比较。The actual temperature of the oxygen fed into the furnace is compared with the predetermined temperature.

如果实际温度明显大于预定温度，则减少第二部分的烟气量；如果小于预定温度，则增加第二部分的烟气量。If the actual temperature is significantly higher than the predetermined temperature, then reduce the amount of flue gas in the second part; if it is lower than the predetermined temperature, then increase the amount of flue gas in the second part.

第一部分烟气、第二部分烟气和第三部分烟气的量可以根据烟气的用途进行调节，一般情况下，第一部分烟气的量占全部烟气量的50%～70%，第二部分的烟气量占全部烟气量的15%～25%。The amount of the first part of the flue gas, the second part of the flue gas and the third part of the flue gas can be adjusted according to the use of the flue gas. Generally, the amount of the first part of the flue gas accounts for 50% to 70% of the total flue gas volume. The flue gas volume of the second part accounts for 15% to 25% of the total flue gas volume.

第二部分烟气和第三部分烟气经换热后混合送入烟气冷凝器17，冷凝至常温后送入烟气压缩机10；The second part of flue gas and the third part of flue gas are mixed and sent to the flue gas condenser 17 after heat exchange, and sent to the flue gas compressor 10 after being condensed to normal temperature;

空气经过空气压缩机7压缩后，经过压缩空气低压给水加热器8冷却后送入制氧系统9，制氧系统9产生的氧气送入氧气预热器2，制氧系统9的产生的其他气体不作处理；After the air is compressed by the air compressor 7 and cooled by the compressed air low-pressure feed water heater 8, it is sent to the oxygen production system 9, and the oxygen produced by the oxygen production system 9 is sent to the oxygen preheater 2, and other gases produced by the oxygen production system 9 do not process;

空气压缩机7产生的压缩空气及烟气压缩机10产生的压缩烟气对锅炉低压给水进行加热。The compressed air generated by the air compressor 7 and the compressed flue gas generated by the flue gas compressor 10 heat the boiler low-pressure feed water.

将所述压缩空气低压给水加热器8出口实际水温与预定温度比较，如果低于预定温度，则减少所述第三水泵15抽水量；如果高于预定温度，则增加所述第三水泵15抽水量。The actual water temperature at the outlet of the compressed air low-pressure feedwater heater 8 is compared with the predetermined temperature, if it is lower than the predetermined temperature, then reduce the pumping capacity of the third water pump 15; if it is higher than the predetermined temperature, then increase the water pumping of the third water pump 15 quantity.

将所述压缩烟气低压给水加热器11出口实际水温与预定温度比较，如果低于预定温度，则减少所述第四水泵16抽水量；如果高于预定温度，则增加所述第四水泵16抽水量。Compare the actual water temperature at the outlet of the compressed flue gas low-pressure feed water heater 11 with the predetermined temperature, if it is lower than the predetermined temperature, then reduce the pumping capacity of the fourth water pump 16; if it is higher than the predetermined temperature, then increase the pumping capacity of the fourth water pump 16 Pumping capacity.

本发明还提供了一种富氧燃烧热量梯级利用的装置，该装置包括锅炉1、氧气预热器2、烟气给水加热器、压缩空气低压给水加热器8、制氧系统9、压缩烟气低压给水加热器11、空气压缩机7、烟气压缩机10、烟气冷凝器17；The present invention also provides a device for cascaded utilization of oxygen-enriched combustion heat. The device includes a boiler 1, an oxygen preheater 2, a flue gas feedwater heater, a compressed air low-pressure feedwater heater 8, an oxygen production system 9, a compressed flue gas Low pressure feed water heater 11, air compressor 7, flue gas compressor 10, flue gas condenser 17;

锅炉1包括第一烟气出口端、第二烟气出口端和第三烟气出口端，第一烟气出口端与锅炉1的第一烟气进口端相连；第二烟气出口端与氧气预热器2的烟气进口端相连，第三烟气出口端与烟气给水加热器的烟气进口端相连；氧气预热器2的烟气出口端烟气给水加热器的烟气出口端分别与烟气冷凝器17的烟气进口端相连；The boiler 1 includes a first flue gas outlet, a second flue gas outlet and a third flue gas outlet, the first flue gas outlet is connected to the first flue gas inlet of the boiler 1; the second flue gas outlet is connected to the oxygen The flue gas inlet port of the preheater 2 is connected, and the third flue gas outlet port is connected with the flue gas inlet port of the flue gas water heater; the flue gas outlet port of the oxygen preheater 2 is connected to the flue gas outlet port of the flue gas water heater respectively connected to the flue gas inlet port of the flue gas condenser 17;

空气压缩机7空气出口端与压缩空气低压给水加热器8压缩空气进口端相连，压缩空气低压给水加热器8的空气出口端与制氧系统9的空气进口端相连，制氧系统9的氧气出口端与氧气预热器2的氧气进口端相连；The air outlet of the air compressor 7 is connected to the compressed air inlet of the compressed air low-pressure feedwater heater 8, the air outlet of the compressed air low-pressure feedwater heater 8 is connected to the air inlet of the oxygen generation system 9, and the oxygen outlet of the oxygen generation system 9 The end is connected with the oxygen inlet end of the oxygen preheater 2;

烟气压缩机10烟气出口端与压缩烟气低压给水加热器11压缩烟气进口端相连。The flue gas outlet end of the flue gas compressor 10 is connected to the compressed flue gas inlet end of the compressed flue gas low-pressure feed water heater 11 .

所述烟气给水加热器包括烟气高压给水加热器3和烟气低压给水加热器4，所述烟气高压给水加热器3的烟气进口端与锅炉1的第三烟气出口端相连；烟气高压给水加热器3的烟气出口端与烟气低压给水加热器4的烟气进口端相连，烟气低压给水加热器4的烟气出口端与冷凝17的烟气进口端相连。The flue gas feedwater heater includes a flue gas high-pressure feedwater heater 3 and a flue gas low-pressure feedwater heater 4, and the flue gas inlet end of the flue gas high-pressure feedwater heater 3 is connected to the third flue gas outlet end of the boiler 1; The flue gas outlet of the flue gas high-pressure feedwater heater 3 is connected to the flue gas inlet of the flue gas low-pressure feedwater heater 4 , and the flue gas outlet of the flue gas low-pressure feedwater heater 4 is connected to the flue gas inlet of the condensation 17 .

所述烟气高压给水加热器3的给水进口端连接有用于抽取锅炉高压给水的第一水泵13，烟气高压给水加热器3设置第一流量控制器控制水泵的抽水量；所述烟气低压给水加热器4的给水进口端连接有用于抽取锅炉低压给水的第二水泵14，烟气低压给水加热器4设置第二流量控制器控制水泵的抽水量；所述压缩空气低压给水加热器8给水进口端连接有用与抽取锅炉低压给水的第三水泵15，压缩空气低压给水加热器8设置第三流量控制器控制水泵的抽水量；所述压缩烟气低压给水加热器11给水进口端连接有用于抽取锅炉低压给水的第四水泵16，压缩烟气低压给水加热器11设置第四流量控制器控制水泵的抽水量。The feedwater inlet end of the flue gas high-pressure feed water heater 3 is connected with a first water pump 13 for extracting boiler high-pressure feed water, and the flue gas high-pressure feed water heater 3 is provided with a first flow controller to control the pumping volume of the water pump; The feedwater inlet end of the feedwater heater 4 is connected with a second water pump 14 for extracting boiler low-pressure feedwater, and the flue gas low-pressure feedwater heater 4 is provided with a second flow controller to control the pumping volume of the water pump; the compressed air low-pressure feedwater heater 8 feeds water The inlet end is connected with the third water pump 15 useful for extracting boiler low-pressure feed water, and the compressed air low-pressure feed water heater 8 is provided with a third flow controller to control the pumping volume of the water pump; the feed water inlet end of the compressed flue gas low-pressure feed water heater 11 is connected with a The fourth water pump 16 for extracting the low-pressure feed water of the boiler, and the compressed flue gas low-pressure feed water heater 11 is provided with a fourth flow controller to control the pumping volume of the water pump.

上述烟气给水加热器包括烟气高压给水加热器3和烟气低压给水加热器4，烟气高压给水加热器3的烟气进口端与所述第三部分烟气出口端相连，第三部分烟气首先进入烟气高压给水加热器3对高压给水进行加热，然后再进入烟气低压给水加热器4对低压给水进行加热，实现了能量的梯级利用，减少汽轮机抽气量。The above-mentioned flue gas feedwater heater includes a flue gas high-pressure feedwater heater 3 and a flue gas low-pressure feedwater heater 4. The flue gas inlet end of the flue gas high-pressure feedwater heater 3 is connected to the flue gas outlet end of the third part, and the third part The flue gas first enters the flue gas high-pressure feed water heater 3 to heat the high-pressure feed water, and then enters the flue gas low-pressure feed water heater 4 to heat the low-pressure feed water, realizing cascade utilization of energy and reducing the gas extraction volume of the steam turbine.

所述压缩空气低压给水加热器8的空气进口端与空气压缩机7空气出口端相连，所述压缩烟气低压给水加热器11的烟气进口端与烟气压缩机10烟气出口端相连。The air inlet of the compressed air low-pressure feedwater heater 8 is connected to the air outlet of the air compressor 7 , and the flue gas inlet of the compressed flue gas low-pressure feedwater heater 11 is connected to the flue gas outlet of the flue gas compressor 10 .

当烟气给水加热器管路压降较高时，为顺利实现给水在烟气给水加热器和汽轮机之间的流动，可以在烟气高压给水加热器3与汽轮机之间设置第一水泵13，第一水泵13用于抽取高压给水，在高压给水加热器3完成对高压给水的加热后，该部分高压给水与高压回热器加热的给水混合，进行后续的加热处理。When the pressure drop of the flue gas feed water heater pipeline is high, in order to smoothly realize the flow of feed water between the flue gas feed water heater and the steam turbine, a first water pump 13 can be set between the flue gas high-pressure feed water heater 3 and the steam turbine, The first water pump 13 is used to pump high-pressure feed water. After the high-pressure feed water heater 3 finishes heating the high-pressure feed water, this part of the high-pressure feed water is mixed with the feed water heated by the high-pressure regenerator for subsequent heating treatment.

同理，可以在低压给水加热器4和汽轮机的管路之间设置第二水泵114，用于抽取汽轮机的低压给水；在压缩空气低压给水加热器8和汽轮机之间设置第三水泵15，用于抽取汽轮机的低压给水；在压缩烟气低压给水加热器11和汽轮机之间设置第四水泵16，用于抽取汽轮机的低压给水。In the same way, the second water pump 114 can be set between the low-pressure feed water heater 4 and the pipeline of the steam turbine, for extracting the low-pressure feed water of the steam turbine; the third water pump 15 can be set between the compressed air low-pressure feed water heater 8 and the steam turbine, It is used to extract the low-pressure feed water of the steam turbine; the fourth water pump 16 is arranged between the compressed flue gas low-pressure feed water heater 11 and the steam turbine, and is used for extracting the low-pressure feed water of the steam turbine.

如果给水能够自然地进入给水加热器，可以省略第一水泵13、第二水泵14、第三水泵15和第四水泵16。If the feed water can naturally enter the feed water heater, the first water pump 13 , the second water pump 14 , the third water pump 15 and the fourth water pump 16 can be omitted.

本发明可以显著提高富氧燃烧电站的发电效率，降低燃煤电站CO2捕集的成本。锅炉的烟气热量、制氧系统中压缩空气的热量和烟气净化压缩系统中压缩烟气的热量得到了充分的利用，实现了富氧燃烧系统内部能量的梯级利用，从整体上提高了机组的发电效率。The invention can significantly improve the power generation efficiency of the oxygen-enriched combustion power station and reduce the cost of CO2 capture in the coal-fired power station. The flue gas heat of the boiler, the heat of the compressed air in the oxygen generation system and the heat of the compressed flue gas in the flue gas purification compression system have been fully utilized, realizing the cascade utilization of the internal energy of the oxygen-enriched combustion system, and improving the unit as a whole. power generation efficiency.

以上对本发明所提供的富氧燃烧热量梯级利用的方法及装置进行了详细的介绍。本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想。应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以对本发明进行若干改进和修饰，这些改进和修饰也落入本发明权利要求的保护范围内。The method and device for cascaded utilization of oxygen-enriched combustion heat provided by the present invention have been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention, and the descriptions of the above embodiments are only used to help understand the method and core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (7)

1. the method for an oxygen-enriched combusting heat cascade utilization is characterized in that, this method may further comprise the steps:
Steps A: boiler (1) outlet flue gas shunting is become first's flue gas, second portion flue gas and third part flue gas; Described first flue gas is sent into the burner hearth of boiler (1) again as circulating flue gas, and described second portion flue gas carries out preheating to the oxygen of sending into boiler (1), and described third part flue gas feeds water to boiler (1) high and low pressure and heats;
Step B: second portion flue gas and third part flue gas mix after heat exchange sends into flue gas condenser (17), sends into flue gas compressor (10) after being condensed to normal temperature;
Step C: after air compressed through air compressor (7), through sending into oxygen generation system (9) after compressed air low-pressure feed heater (8) cooling, oxygen generation system produced the oxygen of (9) and sends into oxygen preheat device (2);
Step D: the compression flue gas that the compressed air that air compressor (7) produces and flue gas compressor (10) produce heats the boiler low pressure feed water.
2. the method for oxygen-enriched combusting heat cascade utilization as claimed in claim 1 is characterized in that, also comprises in the steps A oxygen actual temperature after the preheating and predetermined temperature are compared, if be lower than predetermined temperature, then increases the second portion exhaust gas volumn; If be higher than predetermined temperature, then reduce the second portion exhaust gas volumn.
3. the method for oxygen-enriched combusting heat cascade utilization as claimed in claim 1 or 2 is characterized in that, first's flue gas accounts for 50%～70% of whole flue gases in the described steps A, and the second portion flue gas accounts for 15%～25% of whole flue gases.
4. the method for oxygen-enriched combusting heat cascade utilization as claimed in claim 1 is characterized in that, mixes or send into separately the burner hearth of boiler in the steps A through the oxygen of preheating and circulating flue gas.
5. the device of an oxygen-enriched combusting heat cascade utilization, it is characterized in that this device comprises boiler (1), oxygen preheat device (2), flue gas feed-water heater, compressed air low-pressure feed heater (8), oxygen generation system (9), compression flue gas low-pressure feed heater (11), air compressor (7), flue gas compressor (10), flue gas condenser (17);
Boiler (1) comprises first smoke outlet, second smoke outlet and the 3rd smoke outlet, and first smoke outlet links to each other with the first gas approach end of boiler (1); Second smoke outlet links to each other with the gas approach end of oxygen preheat device (2), and the 3rd smoke outlet links to each other with the gas approach end of flue gas feed-water heater; The smoke outlet of the smoke outlet flue gas feed-water heater of oxygen preheat device (2) links to each other with the gas approach end of flue gas condenser (17) respectively;
Air compressor (7) air outlet slit end links to each other with compressed air low-pressure feed heater (8) compressed air inlet end, the air outlet slit end of compressed air low-pressure feed heater (8) links to each other with the air intlet end of oxygen generation system (9), and the oxygen outlet end of oxygen generation system (9) links to each other with the oxygen inlet end of oxygen preheat device (2);
Flue gas compressor (10) smoke outlet links to each other with compression flue gas low-pressure feed heater (11) compression gas approach end.
6. the device of oxygen-enriched combusting heat step as claimed in claim 5, it is characterized in that, described flue gas feed-water heater comprises flue gas high-pressure feed-water heater (3) and flue gas low-pressure feed heater (4), and the gas approach end of described flue gas high-pressure feed-water heater (3) links to each other with the 3rd smoke outlet of boiler (1); The smoke outlet of flue gas high-pressure feed-water heater (3) links to each other with the gas approach end of flue gas low-pressure feed heater (4), and the smoke outlet of flue gas low-pressure feed heater (4) links to each other with the gas approach end of condensation (17).
7. the device of oxygen-enriched combusting heat cascade utilization as claimed in claim 6, it is characterized in that, the feed-water inlet end of described flue gas high-pressure feed-water heater (3) is connected with for first water pump (13) that extracts the Boiler High Pressure feedwater, and flue gas high-pressure feed-water heater (3) arranges the pump-out of first flow controller control water pump; The feed-water inlet end of described flue gas low-pressure feed heater (4) is connected with for second water pump (14) that extracts the boiler low pressure feed water, and flue gas low-pressure feed heater (4) arranges the pump-out of second flow controller control water pump; Described compressed air low-pressure feed heater (8) feed-water inlet end is connected with to be used and the 3rd water pump (15) that extracts the boiler low pressure feed water, and compressed air low-pressure feed heater (8) arranges the pump-out of the 3rd flow controller control water pump; Described compression flue gas low-pressure feed heater (11) feed-water inlet end is connected with for the 4th water pump (16) that extracts the boiler low pressure feed water, and compression flue gas low-pressure feed heater (11) arranges the pump-out of the 4th flow controller control water pump.
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